linux-kernel - Re: [PATCH 07/12] dt-bindings: net: Add StarFive JH7100 SoC

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Message-ID: <a824a7f6-0a62-7cab-180b-f20297311a2b@collabora.com>
Date:   Fri, 17 Feb 2023 02:32:45 +0200
From:   Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Conor Dooley <conor@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 07/12] dt-bindings: net: Add StarFive JH7100 SoC

On 2/16/23 19:54, Andrew Lunn wrote:
>> I gave "rgmii-id" a try and it's not usable, I get too many errors. So
>> "rgmii" should be the right choice here.
> 
> I would actually say it shows we don't understand what is going on
> with delays. "rgmii" is not every often the correct value. The fact it
> works suggests the MAC is adding delays.
> 
> What value are you using for starfive,gtxclk-dlychain ? 

This is set to '4' in patch 12/12.

> Try 0 and then "rgmii-id"

I made some more tests and it seems the only stable configuration is 
"rgmii" with "starfive,gtxclk-dlychain" set to 4:

phy-mode | dlychain | status
---------+----------+--------------------------------------------
rgmii    |        4 | OK (no issues observed)
rgmii-id |        4 | BROKEN (errors reported [1])
rgmii    |        0 | UNRELIABLE (no errors, but frequent stalls)
rgmii-id |        0 | BROKEN (errors reported)

[1] Reported errors in case of BROKEN status:
$ grep '' /sys/class/net/eth0/statistics/* | grep -v ':0$'

/sys/class/net/eth0/statistics/rx_crc_errors:6
/sys/class/net/eth0/statistics/rx_errors:6
/sys/class/net/eth0/statistics/tx_bytes:10836
/sys/class/net/eth0/statistics/tx_packets:46

> 	Andrew			
>